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STOCK-BASED COMPENSATION - Description of Equity Incentive Plans Narrative (Details) - $ / shares | Sep. 30, 2021 | May 19, 2021 | Dec. 31, 2020 | May 20, 2020
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock, par value (in usd per share) | $ 0.00001 | $ 0.00001 | $ 0.00001 | $ 0.00001
2021 Plan, Newly Reserved Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Capital shares reserved for future issuance (in shares) |  | 9,100,456 |  |
2021 Plan, Returning Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Capital shares reserved for future issuance (in shares) |  | 5,256,517 |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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